114 lines
4.2 KiB
C
114 lines
4.2 KiB
C
/** @file
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* Declaration of CRC-16 routines and table
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*
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* 2004 Richard van der Hoff <richardv@mxtelecom.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef __CRC16_H__
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#define __CRC16_H__
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#include <wireshark.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* Calculate the CCITT/ITU/CRC-16 16-bit CRC
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(parameters for this CRC are:
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Polynomial: x^16 + x^12 + x^5 + 1 (0x1021);
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Start value 0xFFFF;
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XOR result with 0xFFFF;
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First bit is LSB)
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*/
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/** Compute CRC16 CCITT checksum of a buffer of data.
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@param buf The buffer containing the data.
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@param len The number of bytes to include in the computation.
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@return The CRC16 CCITT checksum. */
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WS_DLL_PUBLIC uint16_t crc16_ccitt(const uint8_t *buf, unsigned len);
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/** Compute CRC16 X.25 CCITT checksum of a buffer of data.
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@param buf The buffer containing the data.
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@param len The number of bytes to include in the computation.
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@return The CRC16 X.25 CCITT checksum. */
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WS_DLL_PUBLIC uint16_t crc16_x25_ccitt_seed(const uint8_t *buf, unsigned len, uint16_t seed);
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/** Compute CRC16 CCITT checksum of a buffer of data. If computing the
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* checksum over multiple buffers and you want to feed the partial CRC16
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* back in, remember to take the 1's complement of the partial CRC16 first.
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@param buf The buffer containing the data.
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@param len The number of bytes to include in the computation.
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@param seed The seed to use.
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@return The CRC16 CCITT checksum (using the given seed). */
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WS_DLL_PUBLIC uint16_t crc16_ccitt_seed(const uint8_t *buf, unsigned len, uint16_t seed);
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/** Compute the 16bit CRC_A value of a buffer as defined in ISO14443-3.
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@param buf The buffer containing the data.
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@param len The number of bytes to include in the computation.
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@return the CRC16 checksum for the buffer */
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WS_DLL_PUBLIC uint16_t crc16_iso14443a(const uint8_t *buf, unsigned len);
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/** Compute the 16bit CRC value of a buffer as defined in USB Specification.
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@param buf The buffer containing the data.
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@param len The number of bytes to include in the computation.
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@return the CRC16 checksum for the buffer */
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WS_DLL_PUBLIC uint16_t crc16_usb(const uint8_t *buf, unsigned len);
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/** Calculates a CRC16 checksum for the given buffer with the polynom
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* 0x5935 using a precompiled CRC table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @return the CRC16 checksum for the buffer
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*/
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WS_DLL_PUBLIC uint16_t crc16_0x5935(const uint8_t *buf, uint32_t len, uint16_t seed);
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/** Calculates a CRC16 checksum for the given buffer with the polynom
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* 0x755B using a precompiled CRC table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @return the CRC16 checksum for the buffer
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*/
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WS_DLL_PUBLIC uint16_t crc16_0x755B(const uint8_t *buf, uint32_t len, uint16_t seed);
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/** Computes CRC16 checksum for the given data with the polynom 0x9949 using
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* precompiled CRC table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @return the CRC16 checksum for the buffer
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*/
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WS_DLL_PUBLIC uint16_t crc16_0x9949_seed(const uint8_t *buf, unsigned len, uint16_t seed);
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/** Computes CRC16 checksum for the given data with the polynom 0x3D65 using
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* precompiled CRC table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @return the CRC16 checksum for the buffer
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*/
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WS_DLL_PUBLIC uint16_t crc16_0x3D65_seed(const uint8_t *buf, unsigned len, uint16_t seed);
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/** Computes CRC16 checksum for the given data with the polynom 0x080F using
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* precompiled CRC table
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* @param buf a pointer to a buffer of the given length
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* @param len the length of the given buffer
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* @param seed The seed to use.
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* @return the CRC16 checksum for the buffer
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*/
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WS_DLL_PUBLIC uint16_t crc16_0x080F_seed(const uint8_t *buf, unsigned len, uint16_t seed);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* crc16.h */
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